Device for locks



Nov. 11, -4- 1,514,922

L. oLlvERo DEVICE FOR LOCKS Filed Oct. 12 1922 Patented Nov. 11, 1924.

ET S T LUIG-I OLIVERO, O GENQA, ITALY.

:onvrcr. Forv LOCKS.

Application filed October 12 1322. Serial No. 594,168.

To all whom it may concern Be it known that I, LUlGl Omvinao, me chanical engineer, subject of the King of Italy, and residing at 31 Via XX Sett'embre, Genoa, Italy, have invented certain new and useful Improvements in Devices for Locks, of which the following is a specification.

This invention relatesto improvements in locks and has for its object to provide a lock structure wherein the unauthorized displacement of the bolt of the lock is prevented by a plurality of pivotallymounted and keycontrolled locking members co-acting with segmental flanges provided internally of the lock casing.

A further object is the provision of a lock of this type wherein it is impossible to withdraw the key without having first projected the bolt to operative position.

In the accompanying drawing wherein an approved embodiment of the invention is illustrated Figure l is a vertical sectional view of a lock showing the key withdrawn from the barrel.

Figure 2 is a view similar to Fig. 1 showing the key inserted in the barrel.

Fig. 3 is a transverse sectional view of the key taken on the line OO of Figure 1.

Fig. l is a fragmentary sectional View through the lock and casing showing the barrel and locking members in elevation.

Figure 5 is a transverse sectional view on the line X-X of Fig. 4.

Referring to the drawings in detail the numeral 9 indicates the lock casing, the. opposed walls of which are apertured and ro tatably receive the barrel 3 having a longitudinal bore 3 for the reception of the key 2. The usual bolt 8 is slidably mounted in the casing 9 and is adapted to be projected therefrom incident to rotary movement of the barrel 3 in one direction by a pinion 7 keyed on the barrel 3 meshing with teeth 7* on the bolt 8.

The exterior portion of the barrel 3 lying within the lock casing 9 is provided with pairs of radiating cars 3 the portion of the barrel lying between the ears of each pair being cut away to provide slots 3 through which may work the locking members 1. The locking members are pivotally mounted at 4 between the pairs of ears 3 and they are provided with shoulderslO which normally project into the bore 3 of the barrel 3 and are adapted to be actuated'by the key 2, the locking members being normally retained in inwardly projected position with the shoulders 1O yieldably obstructing the insertion of tl je key 2 by springs 5 carried by the pin- 1on The locking members 1, when the bolt 8 is projected, and the key 2 is withdrawn, normally occupy positions in slots 11 formed radially in a circular flange 6 forming an integral part of or secured to the adjacent wall of the lock casing 9 so that it is impossible to rotate the barrel 3 to effect retraction of the bolt 8. However. in order that the barrel 3 may be revolved in order to retract the bolt upon insertion of the proper key 2 by an authorized person, the

locking members 1 are provided with re cesses 12 which, when registered with the slots 11 in the flange 6, permit the barrel 3 and the locking members 1 to revolve as a unit.

Inorder to establish a non-rotatable connection between the'key 2 and the barrel 3. and also to effect the proper displacement of the locking members 1 whereby to move the recesses 12 thereof into registration with the slots 11, the key shank is provided with a plurality of longitudinal slots 13 in which the shoulders 10 of the locking members slide during insertion of the key and the depth of these slots 13 is such that, when the key is properly inserted in the barrel. 3. the locking members are displaced from the position shown in Fig. 1 to that shown in Fig 2 where the recesses 12 of the looking members: register with the slots 11 in the flange 6 and thus upon turning the key 2 the barrel 3 is moved therewith and the pinion 7 meshing with the teeth 7* of the bolt 8 may retract the latter.

The depth of the grooves 13 decreases towards the extremity of the key shank thereby forming a plurality of cam faces 14, which are designed to prevent the removal of the key 2 from the, barrel 3 except when'the bolt 8 has been either fully projected or fully retracted, it being impossible to remove the key with the bolt 8 in an intermediate position due to the fact that the flanges 6 'occupy the recesses 12 in the lock ng members 1 and prevent further outward swinging movement of the locking members on their pivot pins 4, the cam faces l4; thus enacting with the shoulders l ot the loci/ting; members to prevent the removal of the key.

In the operation of the improver look, when the bolt 8 has been fully projected by the turning: movement of the key 2 and the barrel 3 the key is withdrawn from the barrel, and the springs 5 acting upon. the locking members 1 move the latter inwardly through the slots 11 and the flange 6 and the slots 3" in the barrel 3 and coacting with the segments of said flange 6 prevent such rotary movement of the barrel 3 as would effect retraction of the bolt 8. It is impossible to withdraw the key 2 from the barrel unless the locking members 11 are in such position as to enter the slots 11 due to the fact that the cam faces 14 will engage the shoulders of the locking members and obstruct the out-ward movement of the key. said locking members being prevented from swinging outwardly due to the engagement thereof with the flange 6. When it is desired to retract the boltthe key 2 is inserted in the barrel 3 and the locking members 1 coacting with the walls of the grooves 13 are swung outwardly to such positions that the recesses 12 therein register with the slots 11 and it is thus possible: upon turning the key of the barrel to retract the bolt.

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is:

1. A look comprising a casing, a bolt movable in said casing, a rotatable barrel jouriiialed in said casing. coacting with said bolt to project and retract the latter and having a longitud nal bore spaced projections carried by the casing, pivoted locking members carried by the barrel and normally occupying a position between the projections of the casing whereby to prevent rotation of the barrel, shoulders on said look ing members normally projecting into the bore of said barrel, means normally tending to move the locking members to a position wherein their rotary movement about the axis of the barrel is Ol')Sill1Ct6d by said spaced projections means adapted, when said locking members are moved to a predetermined position with respect to the barrel, to permit said barrel to rotate about its axis, and a key adapted for insertion in the bore of said barrel for moving said tion.

2. A look as claimed in claim 1 having a 

